NTFS: Fix a bug in address space operations error recovery code paths where

      if the runlist was not mapped at all and a mapping error occured we
      would leave the runlist locked on exit to the function so that the
      next access to the same file would try to take the lock and deadlock.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

1 files changed, 12 insertions, 4 deletions

diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 24c46c200337..3f43bfe6184e 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -264,7 +264,8 @@ lock_retry_remap:
                                         goto lock_retry_remap;
                                 rl = NULL;
                                 lcn = err;
-                        }
+                        } else if (!rl)
+                                up_read(&ni->runlist.lock);
                         /* Hard error, zero out region. */
                         bh->b_blocknr = -1;
                         SetPageError(page);
@@ -690,7 +691,8 @@ lock_retry_remap:
                                 goto lock_retry_remap;
                         rl = NULL;
                         lcn = err;
-                }
+                } else if (!rl)
+                        up_read(&ni->runlist.lock);
                 /* Failed to map the buffer, even after retrying. */
                 bh->b_blocknr = -1;
                 ntfs_error(vol->sb, "Failed to write to inode 0x%lx, "
@@ -965,8 +967,11 @@ lock_retry_remap:
                                         if (err2 == -ENOMEM)
                                                 page_is_dirty = TRUE;
                                         lcn = err2;
-                                } else
+                                } else {
                                         err2 = -EIO;
+                                        if (!rl)
+                                                up_read(&ni->runlist.lock);
+                                }
                                 /* Hard error.  Abort writing this record. */
                                 if (!err || err == -ENOMEM)
                                         err = err2;
@@ -1660,6 +1665,8 @@ lock_retry_remap:
                                                         "not supported yet. "
                                                         "Sorry.");
                                         err = -EOPNOTSUPP;
+                                        if (!rl)
+                                                up_read(&ni->runlist.lock);
                                         goto err_out;
                                 } else if (!is_retry &&
                                                 lcn == LCN_RL_NOT_MAPPED) {
@@ -1674,7 +1681,8 @@ lock_retry_remap:
                                                 goto lock_retry_remap;
                                         rl = NULL;
                                         lcn = err;
-                                }
+                                } else if (!rl)
+                                        up_read(&ni->runlist.lock);
                                 /*
                                  * Failed to map the buffer, even after
                                  * retrying.